Here you can find the source of isNotEmpty(Collection extends Object> list)
public static boolean isNotEmpty(Collection<? extends Object> list)
//package com.java2s; import java.util.Collection; import java.util.Map; public class Main { public static boolean isNotEmpty(Map<? extends Object, ? extends Object> map) { return (map != null) && (!map.isEmpty()); }/*w ww .ja va 2 s .co m*/ public static boolean isNotEmpty(Collection<? extends Object> list) { return (list != null) && (!list.isEmpty()); } public static boolean isEmpty(Map<? extends Object, ? extends Object> map) { return (map == null) || (map.isEmpty()); } public static boolean isEmpty(Collection<? extends Object> list) { return (list == null) || (list.isEmpty()); } }